Reviews of JWT ECU?

[fiznat]

Well I think I might be changing the direction of my turbo project. Some of you might know that I was planning on using the extra injector design, but I think I have decided against it. I realised that the expense for that type of setup is pretty high, and I gain only a level of tunability that is somewhat questionable.

Soooo I'm re-considering the JWT ECU. I have always wanted to model my goals towards what Dennis has (that's pretty much exactly what I want, except I'll have forged pistons), so why not copy him on the ECU design as well?

I was wondering if there is anybody here who has some solid experience with the JWT ECU, and would like to share how they feel about it. I have heard several bad things (like overly conservative timing, difficulties requiring re-burns, etc) about them, but also plenty good as well. If some of you experienced guys could share your opinion I would really appreciate it.

Thanks!

[bruinbear714]

Well I think I might be changing the direction of my turbo project. Some of you might know that I was planning on using the extra injector design, but I think I have decided against it. I realised that the expense for that type of setup is pretty high, and I gain only a level of tunability that is somewhat questionable.

Soooo I'm re-considering the JWT ECU. I have always wanted to model my goals towards what Dennis has (that's pretty much exactly what I want, except I'll have forged pistons), so why not copy him on the ECU design as well?

I was wondering if there is anybody here who has some solid experience with the JWT ECU, and would like to share how they feel about it. I have heard several bad things (like overly conservative timing, difficulties requiring re-burns, etc) about them, but also plenty good as well. If some of you experienced guys could share your opinion I would really appreciate it.

Thanks!

Why not just go with emanage, or standalone? It offers a lot more flexability than a JWT ecu. Most likely, you're going to be running rich with the JWT ecu and will want an safc/emanage to fine tune it. That'll cost clost to $1000 and you will have gotten nowhere.

[Structure240sx]

i have my jwt ecu sitting in my room right now. im just waiting for a connector to put my z32 maf before i put the ecu in. i will be finding the air/fuel ratio with a wideband setup my uncles shop has. as long as the snow stays away i should have it in next week as sson as that connector gets here. the ecu is tuned for 740cc injectors, z32 maf, 9:1 comp, auto->maunal, and egr resistor. those last two dont make a difference in the tuning.

about the re-tuning on the ecu i wouldnt worry about it. with the way ur goin ur goin to do everything all at once, have a built block and fuel system there jsut like me. the only reason u would need to retune it would be if u changed injectors, compression or maf but y would u unless u upgrade slowly. also maybe if get some "wild" cams. u dont need to retune for a different intake or exhuast so who cares. and whats wrong with running a lil rich to be safe rather than getting an extra 10rwhp and risking a $3000 engine

[Nathan]

Good call Structure, frequently people dont look at it from the all at once point of view. I know I personally wont be changing much of anything once the car is together because I'm building it how I want (engine wise) from the beginning. For as many people as say the JWT ecu runs rich, I've seen plenty of dyno charts with spot on A/F ratios as well. JWT ecu's seem to really excel at a bit higher boost than some people run, I'd say centered around 15psi is where I've seen them look like they were working best. Fiznat, you'll have my review soon brotha

[andrave]

jwt ecu:plug and play, more or less idiot proof. If you want, you can drive to JWT and run the dyno and you won't have to worry about the "tuning" part. emanage, you can tune yourself, you don't have to send it in if you change injectors or anything, but you will need dyno time and some knowledge of what the hell you are doing to get it done right. Also, not very many people seem to have everything ironed out with emanage, its relatively new and I haven't talked to anyone running one on a turbo KA yet.Hacked mafs and safc seems to be pretty reliable, you can tune it yourself, but you are still gonna need timing control for higher boost and the price of btm plus safc and you have emanage or jwt, both of which can handle fuel and timing. JWT is the most expensive but the most fool proof.

[Structure240sx]

no offense to anyone but he jsut wants to know about the jwt. there are already a couple threads comparing other options

[bruinbear714]

jwt ecu:plug and play, more or less idiot proof. If you want, you can drive to JWT and run the dyno and you won't have to worry about the "tuning" part. emanage, you can tune yourself, you don't have to send it in if you change injectors or anything, but you will need dyno time and some knowledge of what the hell you are doing to get it done right. Also, not very many people seem to have everything ironed out with emanage, its relatively new and I haven't talked to anyone running one on a turbo KA yet.Hacked mafs and safc seems to be pretty reliable, you can tune it yourself, but you are still gonna need timing control for higher boost and the price of btm plus safc and you have emanage or jwt, both of which can handle fuel and timing. JWT is the most expensive but the most fool proof.

I don't mean to sound biased towards the e-manage or against JWT. I have done my research on all the available fuel management options and for 95% of the KA-T guys, any one of these (safc, emanage, jwt, or standalone) will do and ALL get the job done when used correctly.

It's just that each has its own advantages over the other. For me, paying $600 for a JWT ecu and each $100 for a retune doesn't seem financially advantageous. If it cost $400, then maybe.

As a comparison, I got my E-manage, harnesses, support cd and cable for under $400. Installed it in my car and played around with the software while the car was idling. It can do pretty much everything that's in a JWT ecu, but takes a little more work and knowledge.

Bottom line is if you already have a fixed power goal in mind and are building up for it in one shot, then JWT would probably be the easiest way to go, but if you're going to start at 4psi and work your way up to 10psi, then I would recommend the safc or emanage.

[andrave]

bruin bear, can emanage support 850cc injectors on a Z32 mafs?I can't find an answer to that question.sorry for the OT.

[bruinbear714]

bruin bear, can emanage support 850cc injectors on a Z32 mafs?I can't find an answer to that question.sorry for the OT.

It can do the z32 maf, but as for the 850cc, I'm not sure. I know there are people with 550ccs and z32 maf.

The problem basically boils down to the limitation of the ecu's ability to shorten the pulse width to the injector. You can only shorten the width so much, and with 850ccs, it's dumping about 3 times as much fuel as 270ccs at idle. You will have to bump up your idle to compensate for that.

[andrave]

I called greddy just now, they said that even with a Z32 mafs 850 is just too big for e manage to handle, they said the largest it can handle is probably 740's with a z32 mafs, they said on a stock mafs only 550's.Worth mentioning since it means if you want real big injectors JWT or standalone may be all you got.

[MarkEmark]

For people like me, who don't have the know-how or the money or the means to fine-tune an engine with respect to fuel maps, injectors, etc, JWT ECU's cant be beat. Thats why I went the JWT route. Sure, stand-alone and e-manage is great for those who are brave enough to screw around with all that stuff and who have easy access (and funds) for fine-tuning on a dyno, but screwing around with that stuff scares me.

And when all's said and done, I paid $400 for my tuned JWT ECU....found a 95 one on ebay for $300, paid $100 for a re-tune. I would never have paid $600 or $700 either. You just need to look around.

I've been waiting almost 2 weeks so far for it--IT BETTER be here by my birthday (Feb 7) since they got it January 6 (coincidentally my sister's birthday )---they said 2-3 weeks, so I'm giving it 4 weeks. I'll let you know how it is when I install it.

[C-Kwik]

I don't mean to sound biased towards the e-manage or against JWT. I have done my research on all the available fuel management options and for 95% of the KA-T guys, any one of these (safc, emanage, jwt, or standalone) will do and ALL get the job done when used correctly.

Bottom line is if you already have a fixed power goal in mind and are building up for it in one shot, then JWT would probably be the easiest way to go, but if you're going to start at 4psi and work your way up to 10psi, then I would recommend the safc or emanage.

Yeah, but keep in mind that piggy-backs fight the ecu. The ecu will try to keep it's preset stoichiometrc a/f ratios under part throttle. Which can be particularly bad under high boost at part throttle where the ecu may keep the a/f ratios on the lean side for a turbo.

Secondly, timing becomes an issue when you are altering the airflow signal. While the E-Manage and a version of the SAFC can alter the timing, it's still one more thing you have to mess with. When going to higher boost levels, I would probably limit use of a piggy-back. Unless you were using in conjunction with say, a JWT ECU or something and using the piggy-back to fine tune the engine management at WOT.

[andrave]

I think a "problem" with jwt ecu may be that it only works with a few injectors...I called them today and he said that they only have chips available for certain sized injectors (850cc is not one of them).The biggest they have is 72 pound msd/ 740cc nismo, and they are "working" on a 90 whatever pound msd deal. He said it would probably cost me at least 400 bucks for the dyno time and stuff to burn a program for 850's...but then again, they want 600 bucks for an msd 72 pound setup, so its still cheaper.if only they had an east coast dyno somewhere...

[C-Kwik]

That's funny. A couple years ago, I called them about tuning an ECU for 550's. He said the cost would be the same, but I would have to send him one of the injectos I planned to use for testing so they can make sure the program accounts for the variations in actual flow rates and response.

[Projex240]

I got new for ya...the 740's can handle like 560 rwhp. Whats the reason youd like those so much? With JWT, theecua dn injectors can be bought for 550 from stillen, the 72 lbers are like 300 brand new, and then its plug and play. With the 850's its like 600 for the ijectors, the standalone needed to run the is at least 1000, plus dyno time of about 400 bucks. Good luck...then all youd have is alot more injectors than youll even need on a ka-t.

[andrave]

ok, first off that post was typed so poorly that I can't understand what you are trying to say in the beginning of it.Second, I already have 4 850's... they are cheap, easy to find, and large enough to handle any plans that I may have in the future. So if I was able to use the 850's, the injector cost is basically 0, since I already have them and they fit the stock fuel rail. JWT said that their ecu could run them, they just need a few hours of dyno time at 100 an hour, plus the 100 fee to burn a chip. They said to send them one of them to flow test it to make sure it will work ok. Where can you buy a JWT ecu and injectors for 550? what injectors does that come with? I haven't seen anything like that.

The only reason I want to use 850's is because I have them already. But I may try and sell them and get some 72 pound msd's and a mustang fuel rail or something and that way jwt can burn me a program for 100 bucks. If they weren't in california I'd probably just pay for a few hours dyno time and have them make a program for 850s...

[Structure240sx]

72lbs might be $300 but they are top feed injectors where as our stock injectors are side feed. so u have to add the cost of a new top feed fuel rail $150(jgycustoms, i think)-$250(jwt, i know).

[andrave]

jwt told me on the phone their top feed rail is 100 dollars...I think he said his name was brad? anyway I've seen that the mustang fuel rail fits too...and I have a ka24E at home, I'm pretty sure it won't work but I could check the spacing..I really want to use my 850's, I just I had a good way to control them..I found 72 pound msd's on ebay for 260 for 6... thats good...

[Structure240sx]

100 r u serious? i read before it was $250. o well im glad i got my drop in sidefeeds for $425 shipped brand new or i would have gotten top feeds

[andrave]

yeah my 850's are drop in side feeds... but if it costs more to make the 850's work than it would just to buy top feed injectors than it doesn't really make sense, especially when you consider that I could sell the 850's on ebay and get back at least some of what I have in them and put that towards top feeds, and have much less of a hassle making them work, when if I spend all that money making the 850's work, I can't resell any of that (dyno time and such).

[Structure240sx]

rx7 injectors u got?

[Structure240sx]

btw wheni say drop in side feed i meant they drop right in no modification.

[andrave]

yes rx-7, I checked they seem to fit perfect.

[Structure240sx]

no ****. someone send me a link before to a site saying u needed difference o rings and collars or sumthin along the lines of that

[andrave]

yeah I sent that link, I can repost if you want, its the 550's that need sanded and collars. the 850's pretty much drop in. They make some collar spacers for them but it doesn't look like you would need them. The guy even said in the page about it that for the 850's, any collars are pretty much optional...anyway the 550's, apparently require the collars and you have to sand the base so that they slide all the way in. I don't know about this as I haven't tried it. The 850's I have SEEM to fit the ka24DE fuel rail fine, although I admit I haven't tried (or had the oppurtunity to, since my DE is sittin on a pallet) to test them with pressure.since I got them I've wondered why they weren't more popular with KA owners since I got a set of 4 from an england motorsports place for 160 bucks shipped...if JWT made a program for them they would be pretty much plug and play and would eliminate the hassles of a top feed rail.

[huguetpj]

andrave... if u where to sell the 850s, drop me a line. I might be interested

[andrave]

ok, they are on ebay right now, at 160 bucks at the moment but if you want to buy it now I'll take 240.http://cgi.ebay.com/ebaymotors...%3AIT

Nevermind, someone emailed me, they are sold.

[huguetpj]

Wow... didn't think you were gonna sell them that fast. Thanks anyway.

[andrave]

Me neither, maybe I shoulda asked more for em..sorry that you didn't get a chance on them, good luck finding more, if you check the rotary boards you will find some more soon, I'm sure. Ebay is always a good place to find deals too. If all else fails auto parts stores sell rebuilt ones for around 110 each.if this deal happens to fall through they will stay on ebay, I'll try and send you an email if that happens.

[huguetpj]

If all else fails auto parts stores sell rebuilt ones for around 110 each.

Not in this god forsaken country of mine... jeje. I may go look.

Quote » if this deal happens to fall through they will stay on ebay, I'll try and send you an email if that happens. [/quote]OK.